Highly recommend this one - Ultramarathon Runner Dean Karnazes story of how he became an Ultramarathon Runner. This guy started his Ultra career when one night at a nightclub he was hit on by his non-wife and almost cheated. He excused himself to the restroom, kept right on walking through the kitchen, walked home, put his gardening sneakers on, and ran from San Francisco to Half Moon Bay overnight - 33 miles! He hasn't stopped since --- he goes farther and farther. He's even run 226 miles with no sleep (2 days straight). This book is an amazing insight to his journey and you....should....read....it. BTW - he's going to run 50 marathons in 50 days this Fall, finishing with the New York Marathon. www.ultramarathonman.com